Malicious PDF — malware analysis report

Static analysis result for SHA-256 0171e27266d97cb5…

MALICIOUS

PDF

84.1 KB Created: 2021-07-18 05:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61e9209ea68cf2c6f7d0e775757bb774 SHA-1: 733465f251d24d110d4e03b0f46f51d2d6d31af6 SHA-256: 0171e27266d97cb5e30e86908591cd4b3f8a09647a662d1094e556a368bed78c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sa618ch10jvmotekggv1pdiimc/jodisofofuxosixagonepig.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vrpk3a7r49hc902mromh3om536/80054624677.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4c8f265b---viguroxig.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6937ebbbce869d9be0b69e7e35ac0f12/vilawoxelizax.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/31bce65d1e45bc4ee00dd4c6f96f633c/39630145152.pdf
    • http://bassbasement.org/userfiles/file/4892210088.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc2c829372---nujitimuzuzipapojajixasu.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972aad04618---87610954979.pdf
    • http://abwlargo.com/uploads/files/33323052343.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a5b6f80b00b5ea8a7654d43e4102a727/loledaxisojojepavuretepof.pdf
    • http://clairvoyantinfotech.com/demo/images/44441369072.pdf
    • https://monyetjoget.com/contents//files/gulutepotukutixomokup.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28427967c2---nipolaritup.pdf
    • http://superfishinglewood.com/uploads/files/fezinoraso.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c17a3dac152fbd97a95ce9dd64ffa082/41462891938.pdf
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/rekufugid.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160774a9a67bdd---56574910942.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5ijm44p287t5091uum3lcu4ud1/68080436330.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/rtj8qs3k1ifm14uo7nfuqncd9r/kubetajalusawufoduziz.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba38ada2860---gumamo.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160747c9d4bb69---84919731643.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=show+me+a+map+of+the+area
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e897.bin
e446f3efe71de0ffca1cc3bb856a3b8847bb5cf5b62ccc44ad5553c6a181d853
pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 16624 bytes
font_01_sfnt_off00011381.bin
50a7619e3de4b915639709f6e83af91a997e8b95a5f56af4773c4d715acb1cca
pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 10372 bytes
font_02_sfnt_off00012b12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 16792 bytes